/**
 *     phi
 */

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -o-box-sizing: border-box;
    box-sizing: border-box;
    font-family: "Meiryo", Arial, Helvetica, sans-serif;
    line-height: 1.5em;
}

body {
    font-size: 16px;
}

pre {
    margin: 5px;
    padding: 5px;
    box-shadow: 0px 0px 4px 0px #aaa;
    
    font-family: 'Consolas', 'Monaco', 'ＭＳ ゴシック'
    font-size: 12px;
}

#main {
    display: -webkit-box;
    display: -moz-box;
    display: -o-box;
    display: box;
}

.box {
    -webkit-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
    margin: 20px;
    width: 200px;
    height: 200px;
    border-radius: 5px;
    box-shadow: 0px 0px 12px 0px black;
    
    font-size: 25px;
    text-shadow: 2px 2px 2px black;
    color: white;
    text-align: center;
    line-height: 200px;
}

.box:active {
    box-shadow: inset 0px 0px 4px 1px white,
                inset 0px 0px 16px 0px white,
                inset 0px 0px 32px 0px white;
}

#boxA {
    background-color: red;
}
#boxB {
    background-color: blue;
}